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6. How does temperature affect the rate of photosynthesis?

  • The higher the temperature, the lower the rate of photosynthesis.
  • The higher the temperature, the higher the rate of photosynthesis however temperature limits the rate of photosynthesis. Once the temperature reaches 45(degrees) the enzymes which control photosynthesis will have been denatured.
  • The lower the temperature, the higher the rate of photosynthesis.
  • The lower the temperature, the lower the rate of photosynthesis.

7. Give another adaptation for photosynthesis

  • Their shape
  • Leaves contain chlorophyll which are inside millions of chloroplasts to allow absorption different parts of the spectrum.
  • Tall
  • Because they are green

8. What is the function of the upper epidermis?

  • Transparent to allow sunlight through to other layers.
  • Contains lots of air space to allow optimum gas exchange.
  • Contain guard cells which regulate the opening and closing of the stomata.
  • Contains chloroplasts to absorb maximum amount of light.

9. Describe an experiment to investigate photosynthesis, showing the evolution of oxygen from a water plant and the requirements of light.

  • ADDITIONAL - If you keep the apparatus in the dark, you may be able to collect a gas, but this gas will not relight a glowing splint because it isn't oxygen.
  • PART 1 - You will need a pondweed, beaker, glass tube and a light for this experiment. Firstly, place the pondweed in a flask. Place the light facing the pondweed which will then produce bubbles of oxygen.
  • PART 3 - If the splint relights, oxygen is present. This proves that oxygen is produced through photosynthesis.
  • PART 2 - When the tube is full of gas, test for oxygen by putting a glowing splint quickly into the tube.

10. How does CO2 concentration affect the rate of photosynthesis?

  • The hgiher the concentration of CO2, the higher the rate of photosynthesis however CO2 limits the rate of photosynthesis. After a certain point the increase of CO2 has no further effect.
  • The higher the concentration of CO2, the lower the rate of photosynthesis.
  • The lower the concentration of CO2, the higher the rate of photosynthesis.
  • The lower the concentration of CO2, the lower the rate of photosynthesis.

11. How is a leaf adapted for photosynthesis

  • Tall
  • Their shape
  • Broad and flat to provide a huge surface area for absorption of light
  • Because they are green

12. What is the function of the Lower Epidermis

  • Contain guard cells which regulate the opening and closing of the stomata.
  • Transparent to allow sunlight through to other layers.
  • Cells towards the top of the leaf contain chloroplasts which allow maximum absorption of sunlight
  • Cells contain lots of air spaces which are connected to the stomata which allow optimum exchange of gases

13. What is the function of the spongy mesophyll

  • Cells towards the top of the leaf contain chloroplasts which allow maximum absorption of sunlight
  • Transparent to allow sunlight through to other layers.
  • Cells contain lots of air spaces which are connected to the stomata which allow optimum exchange of gases
  • Contain guard cells which regulate the opening and closing of the stomata.